Charles morgan



C. MORGAN. GRINDINQ MILL, APPLICATION ruin JUNE7.19I8.

1,306,610. Patented June 10, 1919.

artozvaeqs UNITED STATES PATENT OFFICE.

CHARLES MORGAN, OF FREEPOR'I, ILLINOIS, ASSIGNOB T0 ARCADEMANUFACTURING- COMPANY,-OF FREEPORT, ILLINOIS, A CORPORATION OFILLINOIS.

GRINDING-MILL.

To all whom it may concern I Be it known that I, CHARLES MORGAN, acitizen of the United States, and resident of Freeport, in the county ofStephenson and State of'Illinois, have invented certain new and usefulImprovements in. Grinding- Mills, of which the following aspecification, reference being had therein to the accompanying drawings.j V

This invention relates particularly to household grinding mills and itsobject is to secure a compact mill with few parts, that may be producedat unusually low cost, that is convenientin assemblying, adjusting, andseparating for cleanin or repair, and that has a high degree ofeectiveness and durability.

In the drawings, Figure 1 shows the mill in side elevation. Fig. 2 is avertical section in the plane of the power shaft." Fig.3 is a horizontalsection in the plane of the same shaft. i

Fig. 4 is a front view of the main shell or casing of the mill. 7

.Fig. 5 is arear view of the rotary disk when on the power shaft.

Fig. 6 shows the rear end of the shaft, its sleeve and retaining cotterpin. 7

In these figures, [A represents the body of the main casing having anintegral, forwardly offset support A, B a back plate for the casing,detachably held in place by bolts C and wing nuts G, D a power shaftrotated by a crank E, F a screw for regulating the fineness of theniills product, G a locking nut for the screw F, and H a clamp by whichthe support A may be secured to a table or the like, when desired.

The casing A is a rearwardly open shell having a chamber I to receivegrinding disks J ,K, and in front of this chamber is a recess L from thefront wall of which projects a long boss M to form one bearing for thepower shaft D. This recess is fully open to the chamber I and has anupper opening registering with the lower opening of a hopper N which isformed to fit within ribs upon the casing and is secured thereto by ascrew N fixing it to a lug l 2 of the casing. The casing is furtherprovided with forked lugs O to receive the bolts C. Bolts P fix thegrinding disk J to the front wall of the chamber I and this disk has alarge central opening Q, the lateral walls of which are provided withhooked ofisets Qt which resist movement of material in the direction ofthe shafts rotation. The shaft carries in the recess L apreferablyintegral screw R having an outer diameter nearly equal to that of'theaperture Q. Upon the free end of the shaft is non-rev.- olubly mounted asecondfigrinding disk K which has a central frusto-conical'projection Sextendin' forwardly and provided with exterior spirally inclined feedridges or ribs S. Thls member is also provided with notches S to passover lugs D on the power shaft D and has in its rear face a central,frusto-conical recess. The shaft also has, at some distance in the rearof the disks other similar lugs D The second Specification of LettersPatent: Patented June 10, 1919 Application filed June 7,1913. Serial no.238,674. 7

diskis slipped upon the free end. portion 7 of the shaft, passed overthe first set of lugs and loosely engaged with the lugs of the secondset, whereby the disk is compelled to rotate with the shaft. Upon'thefree end portion of the shaft isthen slipped a sleeve T fitting in said,reoess and'provided with internal grooves T allowing it'topass over thefirst set of lugs so far that it rests'against the bottom of'thefrus'tumsand'barely passes the first set of lugs. Being" loose'fupon theshaft it is then readily rotated to "carry the grooves out of registrywith the lugs, and into one of the grooves is then slipped a springcotter pin V, or the like, to prevent the lug from entering the groove'.Thus the grinding disk is heldfbetween the outer set of lugs andthe'screw or'oifset" on the shaft. The outer disk 'is thus effectivelyand securely held in place although allowed slight adjusting movementwith the shaft and is quickly detached without special tools by merelyremoving the cotter pin. In the 9 end of the shaft is fixed a hardenedsteel plug IN and against this works the rounded end of theadjustingwing screw F, which works in a long boss bearing X upon the back plate13 and is locked by a common milled nut G before mentioned.

The back plate as shown consists of materially more than half a circularplate having near the margin of its inner face a rib or flange closelyfitting Within the walls of the rearwardly open casing A, and alsohaving a central recess in which the closely fitting end portion of theshaft D has a bearing, the shaft thus being held in accurate alinementwith the bearing M upon which less strain is therefore exerted. Theplate also has forwardly flared rectangular opcnings for the squareshafts of the bolts C, so that the latter cannot rotate relatively butcan swing into and out of the forked lugs 0 when the bolts are loosened.The back plate and all its attachments may thus be quickly removed as awhole, exposing the rear disk and the retaining cotter pin, whichobviously cannot possibly move out of place until the back plate isdetached.

The support A has a foot provided with screw holes and further has justabove the foot an arch or aperture through which passes the upperportion of the screw clamp H, that portion being so made as to grip theinner or rear part of the foot, as shown.

In the construction set forth, the shaft has a long bearing in the maincasing member and its rear end portion has a similar bearing in thedetachable back plate, where the adjusting screw abuts the hardenedaxial plug in its end, and when greater fineness is desired, forces theshaft, feed screw, and grinding disk forward together.

This grinding disk and its integral frus tum oppose the rearwardmovement of material advanced by the feed screw, and the frustum withits ribs aids in directing the material into the space between thegrinding disks. Practically, it is found that with the use of the hookedprojections on the walls of the aperture in the fixed disk no ordinarymaterial will clog the mill, but the screw will force it steadilyforward at a rate depending upon the fineness for which the mill hasbeen adjusted. I The shell is of course downwardly open below the disksand the forward ofi'setting of the support allows any common receptacleto be placed upon the table in the rear of the support and below saidopening. Obviously the mill is made up of few parts most of which arecast iron, the least expensive form of metal, and are such as to requireno cores and very little machine work or hand fitting.

WVhat I claim is:

1. The combination with a casing and a grinding disk fixed thereto andhaving a large central opening, of a shaft extending through saidopening and provided with a circumferential shoulder and with two setsof rigid radially projecting lugs in difierent planes transverse to theshaft, a coacting grinding disk upon the shaft, having on one face acentral projection abutting said shoulder and engaging one set of lugsto prevent rotation with respect to the shaft and having on the oppositeface a corresponding recess, and a shaft-incir'cling sleeve grooved toslide over the outer set of lugs upon the shaft, resting against thebottom of said recess, and adapted to rotate and thus engage behind saidlugs.

2. The combination with a shaft having an integral feed screw, a lug atthe end of the feed screw, and a second lug at some distance from thefeed screw, of a grinding disk having a central shaft-receiving openingand a notch to enable it to pass over the second lug and engage thefirst to prevent the disks rotation on the shaft, a sleeve upon theshaft and grooved internally to allow it to pass over the second lug andagainst the disk, and means for preventing accidental outward movementof the sleeve. I

3. The combination with a rearwardly open casing having in front a shaftbearing, of a back plate deta'chably clamped against the open side ofthe casing and having a positioning flange fitting therein and a bearingrecess alining with said bearing, a shaft mounted in said bearing andrecess and having a shoulder and two sets of surface lugs in difierentplanes, a grind ing disk fixed in said casing, co-acting grinding diskresting against said shoulder and engaging the lugs of one set, a sleevemounted upon the shaft, fitting between said co-acting disk and theother set of lugs and internally grooved to pass over the latter, and apin inserted in one of the grooves and held in place by said back plate.

In testimony whereof I hereunto afii'x my signature.

CHARLES MORGAN.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Eaten'ts, Washington, D. c.

